FC-to-FC Singlemode Coupler for Panel-Mount Fiber Links
The TE Connectivity 5504407-2 is a simplex FC fiber optic coupler — a female-to-female adapter that joins two FC-terminated singlemode patch cables in a straight-through connection. It accepts FC connectors on both ends, so there is no mode or polish conversion; the signal path is a simple physical alignment of two ferrules inside a phosphor bronze sleeve. The housing is machined brass with a silver finish, and the coupler mounts into a panel cutout via the bulkhead nut — the threaded barrel passes through the panel and tightens with the included hardware. A dust cap is included to keep the alignment sleeve clean when the port is unmated. This is a straight singlemode coupler — it does not convert between connector types or polish styles. If you need an FC-to-SC, FC-to-LC, or an APC-to-UPC transition, this is not the part. The 5504407-2 is for linking two FC connectors of the same polish on a singlemode link, typically in patch panels, ODFs, or test equipment bulkheads.